The Psychic Knife (サイコカッター Saikokattā?, lit. "Psycho Cutter") is a move that appears in the Sonic the Hedgehog series. It is a technique used by Silver the Hedgehog where he uses his psychokinesis to fire a knife-like wave.
In the console/PC version of Sonic Generations, when using this move, Silver uses his psychokinetic powers to form a concentration of psychic energy that takes the shape of a wide cyan wave which displays electrical discharges. When forming the Psychic Knife, Silver performs a wave-like motion with his left hand, which causes the Psychic Knife to appear in front of him. Once formed, Silver holds the Psychic Knife suspended in front of him while he aims, and then releases it with a swing of his left hand.
In gameplay, the Psychic Knife is used during the boss battle against Silver. Here, Silver can hurl the Psychic Knife at Sonic either horizontally or vertically. When Silver throws a horizontal Psychic Knife, Sonic must jump over it or Slide under it. When Silver throws a vertical Psychic Knife, Sonic must avoid it using Quick Step.
- There is sometimes a glitch that occurs when Silver has performed the Meteor Smash. By waiting until he uses the Psychic Knife the player must approach him to perform the Homing Attack. The Psychic Knife may glitch and stay on the screen as Sonic runs off. It may be noticeable at the Score Screen in the end of the level.